1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Coloumbs law problem

  1. Nov 19, 2015 #1
    1. The problem statement, all variables and given/known data
    Find force on 3uC charge.

    2. Relevant equations

    3. The attempt at a solution
    Assuming the 3uC charge is at point A and others are at point B and C

    FA = FAB + FAC
    FAB = K*(2*3)/5
    FAC = K*(2*3)/5

  2. jcsd
  3. Nov 19, 2015 #2


    User Avatar
    Homework Helper

    Remember, force is vector. The two forces exerted on the 3uC charge have different directions. Add them by their horizontal and vertical components.
    The magnitude of the Coulomb force is inversely proportional to the square of the distance. Correct your formulas.
  4. Nov 20, 2015 #3
    Your relevant equation should include unit vector of r. Calculating 2 charge particles is not a problem but not in 3D or many particles in 2D.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted